public class J1226 {
    public static void main(String[] args){
        /*System.out.println("hello world");//字符串常量
        System.out.println(100);//整型常量
        System.out.println(3.14);//浮点型常量
        System.out.println('A');//字符常量
        System.out.println(true);//布尔常量
        System.out.println(false);//布尔常量
        System.out.println(Integer.MAX_VALUE);
        System.out.println(Integer.MIN_VALUE);
        System.out.println("==================");
        System.out.println(Byte.MIN_VALUE);
        System.out.println(Short.MIN_VALUE);
        System.out.println(Long.MIN_VALUE);
        int b=0,a=1,c=5;
        System.out.println(b);
        System.out.println(a);
        System.out.println(c);
        long d=10L;
        System.out.println(d);

        double a=5,b=2;
        int a1=5,b1=2;
        System.out.println((int)(a/b));
        System.out.println((double)(a1/b1));
        String c="帅b";
        System.out.println(c);
        boolean d= true;
        System.out.println(!d);
        String S1="加油";
        String S2="Johnson";
        System.out.println(S1+S2);
        int num=10;
        String str1=num+"";
        System.out.println(str1);
*/
       // String a="10",b="20";


        //int a=10,b=20;
        //System.out.println("a= "a  +"b= "+b);
        /*int x=0;
        x +=3.5;
        System.out.println(x);
         */
        int num=10;
        String str2=String.valueOf(num);
        String str="100";
        int num2= Integer.parseInt(str);
        System.out.println(str);
        System.out.println(str2);
    }
}
